Health related quality of life and pain management: Quality of life will be assessed by using the generic questionnaire SF-36 v.2 (Jenkinson, 1999). Self-efficacy beliefs for pain will be registered using the self-efficacy subscale for controlling pain developed by Lorig et al (Lorig et al. 1989). The scale is found to be valid and reproducible in patients with chronic arthritis (Lorig et al. 1989).